[PATCH net-next 3/5] mlxsw: spectrum_router: Rollback virtual router adjacency pointer update

[Ido Schimmel]

From: Ido Schimmel <ido...@nvidia.com>

In the rare case where the adjacency pointer cannot be updated for a
given virtual router, rollback the operation so that virtual routers
that are already using the new index will use the old one again.

Signed-off-by: Ido Schimmel <ido...@nvidia.com>
Reviewed-by: Jiri Pirko <j...@nvidia.com>
---
 .../net/ethernet/mellanox/mlxsw/spectrum_router.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c 
b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
index b229f28f6209..316182d6c1e3 100644
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c
@@ -3279,9 +3279,22 @@ static int mlxsw_sp_adj_index_mass_update(struct 
mlxsw_sp *mlxsw_sp,
                                                        nhgi->adj_index,
                                                        nhgi->ecmp_size);
                if (err)
-                       return err;
+                       goto err_mass_update_vr;
        }
        return 0;
+
+err_mass_update_vr:
+       list_for_each_entry_continue_reverse(fib_entry, &nh_grp->fib_list,
+                                            nexthop_group_node) {
+               struct mlxsw_sp_nexthop_group_info *nhgi = nh_grp->nhgi;
+
+               fib = fib_entry->fib_node->fib;
+               mlxsw_sp_adj_index_mass_update_vr(mlxsw_sp, fib->proto,
+                                                 fib->vr->id, nhgi->adj_index,
+                                                 nhgi->ecmp_size,
+                                                 old_adj_index, old_ecmp_size);
+       }
+       return err;
 }
 
 static int __mlxsw_sp_nexthop_update(struct mlxsw_sp *mlxsw_sp, u32 adj_index,
-- 
2.28.0